Indeed I do have IE7 but the problem is also with firefox. So I don't think it has anything to do with the browser.
What version of Firefox?
Honestly, I don't believe the problem is with your video card or the settings related to...of course, that's just me.
As far as I can tell, you're talking about one site, "Continental.com", and you're having problems with the navigation menu on the site displaying correctly.
Does it only pertain to this site...or others, as well?
What makes you think it's your video card?
If it were me, I'd be concentrating on my browsers' settings, or any malware protection software I have installed that may be preventing the browsers from running scripts.
I know you're probably pulling your hair out over this one, but instead of blaming the card...troubleshoot the browsers and malware software as far as you can.